Body Sculpting for Men — Southern California
DR. FLEX® MUSCLE BUILDING
magnetic muscle stimulation for men — at Dr. Vigor® clinics
Strength you've trained for, definition that finally shows. Dr. Flex® magnetic muscle stimulation uses focused magnetic fields to trigger deep, involuntary contractions that strengthen, tone, and firm the muscle beneath — non-surgical, no needles, delivered in sessions at Dr. Vigor® clinics under physician supervision, alongside the training you already do. Individual results vary.
- Non-surgical
- No needles, no anesthesia
- Individual results vary
Not a weight-loss treatment and not a substitute for exercise. Medical screening is required — some conditions, including implanted electronic devices, rule treatment out. Candidacy is determined at a medical consultation.
The results and experiences featured on this site are examples, not promises. Individual results and patient experience vary. A medical consultation is required before any treatment.
What It Is
One name for how we deliver it
Dr. Flex® muscle building is Dr. Vigor's magnetic muscle stimulation service for men — sessions in which a strapped applicator delivers focused magnetic fields to a muscle group, triggering repeated, deep, involuntary contractions — a different stimulus from a voluntary set — to strengthen, tone, and firm the treated muscle.[1] You may see the category called MMS. There's no surgery, no needle, and no anesthesia, and the service is delivered at Dr. Vigor® clinics under physician supervision after a screening consult.
Why a service has a name: magnetic muscle stimulation is a category, and many clinics offer it. The Dr. Flex® service is how it's delivered here — the screening in front of it, the clinical team around it, the series sized to your goal, and the honest read on what it can and can't do. The name is a commitment to how, not a claim about how much.
Regulatory Status
Which muscles, exactly
The device used for Dr. Flex® sessions is FDA-cleared for improvement of abdominal tone, strengthening of the abdominal muscles, and strengthening, toning, and firming of the muscles of the buttocks and thighs.[2] Safety and effectiveness for other areas have not been established, and sessions stay inside that list. The manufacturer's current labeling describes the device as cleared for adults 22 and older, and that's the age line we screen to.
Cleared is the right word, so we use it. FDA clearance means the agency found the device substantially equivalent to one already on the market for those uses — it is not FDA approval, and it is not an endorsement of the device, of this clinic, or of any result.[3]
Why Men Choose It
Core strength and definition where training plateaus
Most men who ask about Dr. Flex® sessions have the same story. They train. The core is strong. And the definition still doesn't show the way the work deserves — or a plateau has set in that more reps aren't moving. Magnetic stimulation goes at that from a different angle: repeated involuntary contractions in a targeted muscle group, without surgery, needles, or a recovery week.[1]
Two things the men who do best understand going in. First, this complements training — it doesn't replace it. The effects of muscle stimulation can be temporary and hold up best alongside the lifting, the eating, and the sleeping you already do — the same habits that keep muscle strong at any age.[4][5] Second, it isn't a weight-loss treatment. If the goal is the number on the scale, our GLP-1 weight-loss program comes first and the definition work comes after. Both doors are open, and your clinician will tell you plainly which to walk through.
The Session
Strong contractions, your ceiling, back to your day
A Dr. Flex® session happens in a private room at a Dr. Vigor® clinic. You lie down in light clothing, an applicator is strapped over the muscle group, and the session starts low. What you feel is a series of strong, involuntary contractions — unlike any gym set — for a few seconds at a time, with rests between. The first minutes are the most intense. As you acclimate, your clinical team may offer to raise the intensity, and the rule is simple: you set the ceiling. It should feel like serious work, never like pain, and if it does, say so and it comes down.
Keep phones, watches, and anything electronic away from the applicator during the session. Session length is set with you at the consult, and most men go straight back to their day afterward with little to no downtime. The next day, expect soreness like the day after a hard workout — it's expected, it's part of how the treatment works, and it passes.[6]
The Series
Results build across sessions, and they're maintained, not banked
Results build across the series — and they're real by the end of it, not the start. No single session builds a muscle, and this one doesn't pretend to. In the published protocols, sessions are delivered as a short series spaced days apart, and whatever change is measured is measured after the course, not after the first visit.[7] Your clinician sets the series that fits your goal at the consult, and reviews it with you as it runs.
Then maintenance. The effects may be temporary and may require ongoing sessions to keep — that is how the category is described in FDA's consumer information.[8] That's not a catch — it's how muscle works. Muscle you use, you keep. Your clinician will tell you whether a maintenance cadence makes sense for you, and you'll decide.
The Evidence
What the research says — the encouraging part first
The category has a real literature, and the encouraging part is real. FDA's consumer information on the category says repeated contraction of a muscle group may improve its tone and firmness, and that the effect may be temporary.[1] Published imaging studies report small increases in muscle thickness after the usual four-session protocol, one small manufacturer-sponsored open-label study reported gains on abdominal performance measures a month after a course of sessions, and across fourteen clinical studies no complications were reported.[7] Individual results vary.
Honest medicine adds the rest, and we'd rather you hear it here. Much of this category's published research is manufacturer-affiliated, and independent confirmation is still maturing. An independent systematic review found the measured changes small — a mean increase in muscle thickness of about 2 millimeters — noted that almost every study was authored by advisors to a device manufacturer, and concluded that the treatments are safe while the evidence for their efficacy is tenuous.[9] That is a fact about the category, not a reason to hide the category — and it is exactly why we don't quote a muscle-growth percentage, why the series is sized to you rather than to a study, and why we measure your progress man by man instead of promising a number.
Safety & Screening
Expected soreness, real bars, and one instruction worth memorizing
The expected effects are the ones a hard workout gives you. The manufacturer's current labeling lists muscle soreness, temporary muscle spasm, temporary joint or tendon discomfort, and local skin redness — starting hours after a session and resolving over days to weeks — and FDA's description of the category names soreness and cramps. Across fourteen published clinical studies, no complications were reported.[6]
The bars are the reason screening comes first. Anyone with an implanted electronic device — a pacemaker, a defibrillator, a neurostimulator, a drug pump, an implanted hearing device — cannot have magnetic muscle stimulation anywhere on the body. No exceptions, and no waiver changes that.[10] Metal in the treatment field, pregnancy, a seizure disorder, active cancer, a bleeding disorder, an active infection or fever, recent surgery in the area, and a hernia at or near the site also rule treatment out or change the plan. Applicators are never placed over the heart, head, neck, or spine, and if you have or may have a heart condition, your clinician needs to know before anything is scheduled. Where the device labeling files some of these as cautions, we count them as stops. That is our standard, and it's on purpose.
Tell your clinician everything else too: a metal implant anywhere, a thyroid condition, kidney disease, or any medication you take. Most of it changes the plan rather than ending it — but that conversation happens before, not after.
Soreness is expected. These three things are not.Disproportionate pain, marked weakness, or dark, cola-colored urine in the one to three days after a session are signs of muscle breakdown that can affect the kidneys — a rare, recognized risk of very intense muscle work of any kind. It has been reported after electrically induced muscle-stimulation training, and magnetic stimulation produces the same kind of intense involuntary work. They warrant urgent medical evaluation, not a wait-and-see.[11] We start every man low, we titrate to his comfort, and we ask about hydration, statins, and recent training before a first session because the first session is where that risk is highest.
Candidacy
Adults, screened, with an honest read on what the muscle is under
Dr. Flex® sessions are for adults 22 and older — the age line in the device's current consumer labeling — who have been screened at a consult by a licensed clinician. The best fit is a man who already trains, is near a weight he can hold, and wants strength and definition in the core, buttocks, or thighs[2] that reps alone aren't delivering.
One honest note for the man carrying more weight than he'd like: a thicker fat layer over the muscle can limit what the field reaches, and the definition it builds won't show through fat that's still there. That's not a no — it's a sequence. For that man, our GLP-1 weight-loss program usually comes first, CoolSculpting® fat reduction may come next, and the muscle work finishes the job. Your clinician will lay the order out plainly, and the choice is yours.
Sessions are performed at Dr. Vigor® clinic locations by our trained clinical team under physician supervision, as part of the plan set at your consult.
Define, Then Reveal
More muscle under the skin. Then less fat over it.
Muscle building defines what's there. For a lot of men, the thing hiding it is a pocket of fat that training never touched — and the answer to that is CoolSculpting® fat reduction, which uses controlled cooling to clear a portion of the fat cells in a treated area over the following weeks.[12] Your clinician may recommend the two in sequence, in whichever order fits your goal. That's a plan built at the consult, not a bundle.
CoolSculpting® is not a weight-loss treatment. Individual results vary. Results build over a recommended series. Candidacy is determined at a medical consultation.
FAQ
Questions, answered
Does Dr. Flex® muscle building replace working out?
No — and it works best for men who don't want it to. Dr. Flex® magnetic muscle stimulation triggers involuntary contractions in a targeted muscle group, but the effects can be temporary and hold up best alongside training — no muscle-stimulation device is cleared for weight loss, and FDA's own consumer guidance says one won't change your appearance dramatically without diet and exercise.[4] Think of it as a targeted addition to the work you already do.
Does it hurt?
It feels like strong, involuntary contractions — intense at first, then something you acclimate to — and the intensity is set to your comfort. You set the ceiling in every Dr. Flex® session: serious work, not pain — and if it hurts during a session, say so and the intensity comes down. The next day expect soreness like the day after a hard workout.[6] Patient experiences vary.
How many sessions will I need?
More than one — results build across a series of sessions spaced days apart, and any change in the published studies is measured after the course, not the first visit.[7] Your clinician sets the Dr. Flex® series that fits your goal at the consult and reviews it with you as it runs. Maintenance sessions may be recommended, because the effects can be temporary.
Can I do it with a pacemaker or another implant?
No. Anyone with an implanted electronic device — a pacemaker, defibrillator, neurostimulator, drug pump, or implanted hearing device — cannot have magnetic muscle stimulation anywhere on the body, and no waiver changes that.[10] Metal in the treatment field is also a bar. Every consult for Dr. Flex® sessions screens for both before anything is scheduled.
How long do results last?
Like muscle built any other way — it holds with use and fades without it. The effects may be temporary and may need ongoing sessions to maintain, which is how FDA's consumer information describes the category.[8] Men who keep training keep the most. Your clinician will tell you whether a maintenance cadence of Dr. Flex® sessions makes sense for you. Individual results vary.
Is it FDA-cleared?
The device used for Dr. Flex® sessions is FDA-cleared for improvement of abdominal tone, strengthening of the abdominal muscles, and strengthening, toning, and firming of the muscles of the buttocks and thighs.[2] Sessions here stay inside that list — safety and effectiveness for other areas have not been established. Cleared means found substantially equivalent to a device already on the market. It isn't FDA approval, and it isn't an endorsement.
What does Dr. Flex® muscle building cost?
Pricing depends on the muscle groups and the series your clinician recommends. You'll know your full cost before you start. Call 949-570-0800 and ask — nobody will make you book to find out.
Is the soreness normal?
Yes — soreness, temporary spasm, and joint or tendon discomfort in the days after a Dr. Flex® session are expected and pass.[6] What is not normal: disproportionate pain, marked weakness, or dark, cola-colored urine in the one to three days after a session. Those are signs of muscle breakdown and warrant urgent medical evaluation.[11]
Citations & References
The research behind this page
Every clinical and regulatory statement on this page resolves to a U.S. government (.gov) record — a National Library of Medicine listing (PubMed or PubMed Central) for peer-reviewed research, an FDA regulatory record, or a federal health authority's own page. Each reference was resolved and checked against that record during the build. Indexing is not endorsement: FDA clearance is not FDA approval, and no citation here implies that any government agency vouches for this clinic, these devices, or any result.
- U.S. Food and Drug Administration. Non-Invasive Body Contouring Technologies. Content current as of October 15, 2025. FDA: pulsed magnetic fields trigger a small electric current in the muscles, causing repeated contractions, and repeated contraction during the procedure may improve muscle tone and firmness of the abdominal muscles or strengthen, tone, and firm the buttocks and thighs — effects that may be temporary and may require ongoing procedures to maintain.
- U.S. Food and Drug Administration, Center for Devices and Radiological Health. 510(k) Premarket Notification K253408 — powered muscle stimulator for muscle conditioning (magnetic muscle stimulation device), 21 CFR 890.5850, product codes NGX and IPF. Decision: substantially equivalent, January 16, 2026. FDA 510(k) K253408 (January 16, 2026): the device class is indicated for improvement of abdominal tone, strengthening of the abdominal muscles, development of a firmer abdomen, and strengthening, toning, and firming of buttocks and thighs — 21 CFR 890.5850, product code NGX (powered muscle stimulator for muscle conditioning).
- U.S. Food and Drug Administration. Is It Really ‘FDA Approved’? Content current as of May 4, 2026. FDA: 510(k) clearance is a showing of substantial equivalence to a legally marketed predicate device, distinct from premarket approval, and FDA's name may not be used to suggest endorsement of any private organization, product, or service.
- U.S. Food and Drug Administration. Non-Invasive Body Contouring Technologies. Content current as of October 15, 2025. U.S. Food and Drug Administration. Electronic Muscle Stimulators. Content current as of December 17, 2017. FDA: non-invasive body contouring does not treat obesity and will not result in weight loss. FDA on muscle stimulators: a device may temporarily strengthen, tone, or firm a muscle, none is cleared for weight loss or girth reduction, and using one alone will not produce dramatic changes in appearance without diet and exercise.
- National Institutes of Health. Maintain Your Muscle. NIH News in Health. March 2020. NIH: maintaining muscle mass and function matters for quality of life at every life stage, regular strength training is associated with lower cardiovascular and chronic-disease risk, and strength can be built at any age.
- Swanson E. A systematic review of electromagnetic treatments for body contouring. Ann Plast Surg. 2023;90(2):180–188. PMID: 36688862. PMC9869942. U.S. Food and Drug Administration. Non-Invasive Body Contouring Technologies. Content current as of October 15, 2025. Swanson 2023: no complications reported across 14 clinical studies. FDA: complications of magnetic-field devices may include muscle soreness and cramps.
- Swanson E. A systematic review of electromagnetic treatments for body contouring. Ann Plast Surg. 2023;90(2):180–188. PMID: 36688862. PMC9869942. Bachelor EP, Kilmer S, Porcari JP, Gamio S. A prospective, open-label study to evaluate functional changes following electromagnetic muscle stimulation of abdominal muscle. Aesthet Surg J Open Forum. 2023;5:ojad045. doi:10.1093/asjof/ojad045. PMID: 37333709. PMC10270651. Swanson 2023 independent systematic review (14 studies): the usual protocol was four treatments over two weeks, imaging studies reported a mean 2.2 mm increment in muscle thickness, and no complications were reported. Bachelor 2023 (manufacturer-sponsored open-label study, 16 participants, level of evidence 4): core strength and abdominal endurance measures significantly greater than baseline at one, two, and three months after eight sessions.
- U.S. Food and Drug Administration. Non-Invasive Body Contouring Technologies. Content current as of October 15, 2025. FDA: the effects of magnetic muscle stimulation may be temporary and may require ongoing procedures to maintain.
- Swanson E. A systematic review of electromagnetic treatments for body contouring. Ann Plast Surg. 2023;90(2):180–188. PMID: 36688862. PMC9869942. Swanson E. Body contouring with electromagnetic treatment plus radiofrequency: a review. Ann Plast Surg. 2025;94(2):250–256. PMID: 39773625. PMC11776875. Swanson 2023: measured treatment effects very small (under 5 mm), measurement variances high, almost all studies authored by medical advisors for the device manufacturer, conflict of interest and publication bias major factors, and the evidence for efficacy tenuous — while the treatments are safe. Swanson 2025 (combination with radiofrequency): all seven studies authored by manufacturer advisors, measured changes likely within the margin of error.
- U.S. Food and Drug Administration. Non-Invasive Body Contouring Technologies. Content current as of October 15, 2025. U.S. Food and Drug Administration. Electronic Muscle Stimulators. Content current as of December 17, 2017. FDA: do not use magnetic-field devices if you have active implants such as a pacemaker or an implantable cardioverter defibrillator, or metal implants. FDA on muscle stimulators: reports of interference with implanted devices such as pacemakers and defibrillators.
- MedlinePlus Medical Encyclopedia. Rhabdomyolysis. U.S. National Library of Medicine. Reviewed September 2, 2025. Kästner A, Braun M, Meyer T. Two cases of rhabdomyolysis after training with electromyostimulation by 2 young male professional soccer players. Clin J Sport Med. 2015;25(6):e71–e73. PMID: 25353720. Mallek W, Kechida M, Jellad A. Electromyostimulation-induced rhabdomyolysis: a case report and comprehensive literature review. Cureus. 2025;17(10):e95125. doi:10.7759/cureus.95125. PMID: 41281094. PMC12635786. MedlinePlus: rhabdomyolysis is the breakdown of muscle tissue releasing its contents into the blood, caused by severe exertion among other things, with dark, red, or cola-colored urine, weakness, and muscle pain among the symptoms — contact your provider if you have them. Kästner 2015 and a 2025 case report with literature review: rhabdomyolysis after electrically induced muscle-stimulation training, including in trained athletes and predominantly after a first session — the analogous risk this page screens for.
- U.S. Food and Drug Administration. Non-Invasive Body Contouring Technologies. Content current as of October 15, 2025. Derrick CD, Shridharani SM, Broyles JM. The safety and efficacy of cryolipolysis: a systematic review of available literature. Aesthet Surg J. 2015;35(7):830–836. PMID: 26038367. FDA: cryolipolysis uses controlled cooling to kill fat cells that the body then clears over two to three months. Derrick 2015 systematic review: a mean 19.55% reduction in the treated fat layer versus an untreated control site.
Getting Started
Start with a consult. FINISH STRONG®.
Getting started is simple.
Step 01
Talk
A focused consult — virtual if you like.
Step 02
Test
An in-person visit: vitals and bloodwork before any products or services.
Step 03
Tune
Proven protocols do the groundwork. Your clinician makes the call — your plan, adjusted over time to your progress and how you actually feel.
Individual results vary. Treatment only when clinically appropriate.
Dr. Vigor® clinics in California are 100% physician-owned. Dr. Flex® magnetic muscle stimulation is provided only after evaluation by a licensed clinician, and only when clinically appropriate. A medical consultation is required before any treatment. Medical screening is required: magnetic muscle stimulation is not provided to anyone with an implanted electronic device, and metal in the treatment field, pregnancy, seizure disorders, active cancer, bleeding disorders, and other conditions may rule treatment out. Sessions are performed at Dr. Vigor clinic locations by the practice's trained clinical team under physician supervision. The device used for Dr. Flex® sessions is FDA-cleared for improvement of abdominal tone, strengthening of the abdominal muscles, and strengthening, toning, and firming of the muscles of the buttocks and thighs; safety and effectiveness for other areas have not been established. FDA clearance is not FDA approval and is not an endorsement. Magnetic muscle stimulation is not a weight-loss treatment and not a substitute for exercise. Results build over a recommended series of sessions, may be temporary, are not guaranteed, and vary by individual. Not all men are candidates. Treatment plans are set by the patient's own licensed clinician, who alone determines candidacy and course of treatment — protocols inform that judgment and never replace it. Dr. Vigor is a concierge clinic group and does not bill insurance. Services available in California at Dr. Vigor clinic locations. CoolSculpting® is a registered trademark of Allergan Aesthetics, an AbbVie company. Dr. Vigor is not affiliated with or endorsed by Allergan Aesthetics.
Dr. Vigor® clinics in California are 100% physician-owned. Dr. Flex® magnetic muscle stimulation is provided only after evaluation by a licensed clinician, and only when clinically appropriate. A medical consultation is required before any treatment. Medical screening is required: magnetic muscle stimulation is not provided to anyone with an implanted electronic device, and metal in the treatment field, pregnancy, seizure disorders, active cancer, bleeding disorders, and other conditions may rule treatment out. Sessions are performed at Dr. Vigor clinic locations by the practice's trained clinical team under physician supervision. The device used for Dr. Flex® sessions is FDA-cleared for improvement of abdominal tone, strengthening of the abdominal muscles, and strengthening, toning, and firming of the muscles of the buttocks and thighs; safety and effectiveness for other areas have not been established. FDA clearance is not FDA approval and is not an endorsement. Magnetic muscle stimulation is not a weight-loss treatment and not a substitute for exercise. Results build over a recommended series of sessions, may be temporary, are not guaranteed, and vary by individual. Not all men are candidates. Treatment plans are set by the patient's own licensed clinician, who alone determines candidacy and course of treatment — protocols inform that judgment and never replace it. Dr. Vigor is a concierge clinic group and does not bill insurance. Services available in California at Dr. Vigor clinic locations. CoolSculpting® is a registered trademark of Allergan Aesthetics, an AbbVie company. Dr. Vigor is not affiliated with or endorsed by Allergan Aesthetics.